A grey crew-neck sweater and navy jeans work together beautifully. Dial down the formality of this ensemble by rocking a pair of white and navy leather high top sneakers. During the winter months, when warmth is the priority, it can be easy to settle for a less-than-stylish ensemble. However, this ensemble proves that you totally can stay cozy and remain equally stylish in the winter months. This combination is a shining example 40-something guys can very well slay in the style department.